Edexcel 6CH07/01- May 8th 2013 - AS Chemistry Unit 3B

It was okay I guess.
In the energy transferred question, was the mass 50 or 55? 😳

Yes I have the same doubt. It was mentioned specific heat capacity of the "mixture"?

What was the answer for the question where they asked why sodium iodide cannot be used to make iodobutane?? (or something to that effect)

Also what was the answer to the very last question..why the above process is not used to produce...something...can't remember what!!!

Hydrogen Iodide has enough reducing power to reduce Concentrated Sulfuric acid so yield would be lower.

What were your answers to the following questions?

Enthlapy in KJ/mol of CuSO4

%error and max temp difference

When HCL was added to KI-observation

Using the same equipment,and a stop clock explain how the accuracy of the experiment could be increased by recording a more accurate temperature difference,considering the same volume of 1 mol/dm^3 CuSO4 and 5g Zinc(4marks)

1-chlorobutane was produced from butan-1-ol by reacting it with PCl5.The products were HCl and POCL(maybe)

explain why 1-chlorobutane cannot be produced industrially by this reaction

What did you write for the observation that you would look for to know that there is no more iodine?


Posted from TSR Mobile

You check and make sure that there is no shiny bluish black solid is visible.

My enthalpy was around 914 kj and for my error i did 0.5/ my temp diff which was around 46. My error was 1.08%
hope that helps

What did you write for the observation that you would look for to know that there is no more iodine?


Posted from TSR Mobile

Not no more iodine the question was very less iodine or something if not what's the use of the thiosulfate solution?
Iodine dissolves in the organic solvent giving a violet purple colour. So that colour should fade away.
right?

Posted from TSR Mobile

My enthalpy was -194KJ/mol my error was 2.2% and temp diff was 47'C

OK our entalpy was the same and also temp diff. I just used 0.5 for my error not 1 maybe that y. Do u know if we r to use 1 or 0.5. And dw ull do great
btw pls gimmie a rep?

Not no more iodine the question was very less iodine or something if not what's the use of the thiosulfate solution?
Iodine dissolves in the organic solvent giving a violet purple colour. So that colour should fade away.
right?

Posted from TSR Mobile

My enthalpy was -194KJ/mol my error was 2.2% and temp diff was 47'C

what were the observations for that iodobutane one and do you think they would give the marks for writing the equation of phosphorus with iodine without balancing